c
PROBLEM
DETERMINATION AND SOLUTION )
Precautions
1.
Be
sure
to
tum
the power switch
OFF
before opening
the
control box cover
or
plugging
in
I unplugging
the
power
cord.
2.
When
replacing a fuse,
be
sure
to
use a
new
one having
the
same
quality
and capacity
as
the
old
one.
Problem determination and solution table
• Prior
to
proceeding
to
the
following
table,
check
that
-no
fuse has
blown
-each
plug is correctly inserted.
• l-etters marked
with
an asterisk (e.g. (a)*) in
the
ct·IECK
I
ADJUSTMENT
I
REPAIR
column indicate
that
those items should be checked
while
the
power
is
applied.·
NO.
IN
CHAPTERS
PROBABLE
CAUSES
·CHECK/
ADJUSTMENT
I
REPAIR
REPLACEMENT
FLOWCHART
AND
ERROR
STATUS
PARTS
#1
1.
Power cord
(a)* Measure voltage between taps 20 and
Power cord
The
POWER
lamp
defective
~
21
on
transformer
in
control box.
will
not
light
when
d~2
Make sure
that
the
measured voltage
the
POWER
switch
matches
the
specification.
isturMd
ON.
__liiiRIII
~
~
[n:l®
311
I I
2.
Fuse
blown
Remove fuse No.2 and check
it
for
Glass
tube
fuse
continuity.
If
there
is
no
continuity, replace
SA
the
fuse.
3.
Power
PCB
(a)*Unplug connector
P8
of
the
main circuit Power
PCB
defective
board,
turn
the
~er
ON,
then
measure
.PI
the' voltage.
If
it
is not
~rox.
10
VDC,
~
the
contrOl
box
is
defe
ve.
NOTE:
lnsertatesterprobe
intothe
connector
from
the
lead
wire
side.
4.
Main
circuit board
(a)*Unplug connector
P7
of
the
main circuit
Maindrcuit
defective
board, tum
the
power
ON,
then
measure
board
2
1
the
voltage
on
the
PCB.
If
it
is
not + 5V,
P7~
the
control
circuit
board
Is
defective.
5.
Panel
drcuit
board
Check
the
connection between
the
panel Panel
drcuit
defective
drcuit
board
and connector
P2
of
the
main board
circuit board.
#2
1.
Connector contact
Oleck
the
connections, harnesses, and
pin
If
the
RJW
switch is
defective
contacts between connector
P2
of
the
main
pressed,
the
circuit board and
the
panel circuit board and
indicator
lamp
on
between
connectors
P3
or
P7
of
the
main
the
floppy
disk
circuit
board and
the
FDD.
drive
(FDD)
does
2.
Main
circuit board
not
light
and the
(a)
Tum
the
power
ON, and press
the
EM
Maindrcuit
FDD does
not
read
defective
switch
to
check
If
the
buzzer sounds
board
the
floppy
disk
intermittent!~
Then press
the
button
data.
~ain
tochec
if
the
buzzerst~
If
the
bUzzer does
not
operate
in
sucn
a
manner,
the
control
drcuit
board is
·defective.
(b)
St~
on
the
presser
ce
lifter switch.
H e presser plate
not
work
normally,
the
control circuit board
Is
defective.
-16-
··
...
~·
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